Loading…
Show current time across timezones. Use when scheduling; for timestamps use timestamp-converter. Input: timezone selection. Returns local times. 100% client-side, files never leave browser.
World Clock is loading — interactive editor will appear here. Use examples below to try instantly once loaded.
Press ? for keyboard shortcuts
Shows current time for 4 default cities (NY/London/Tokyo/Sydney) and lets you add any IANA zone via select (Intl.supportedValuesOf or 20-zone fallback). Displays time via Intl.DateTimeFormat, updates every second, and shows diff vs local.
Remote teams need to see multiple zones and DST at a glance without installing a clock app. This does it with browser Intl APIs, no server, and live updates.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Distributed teams scheduling meetings, travelers checking destination time, and anyone comparing zones before a call.
View 4 default clocks updating every second. Pick a zone from the select to add a custom clock.
Each card shows local time, zone name, and offset/diff vs your local zone.
Remove any custom clock with the X button. All rendering is local via Intl.
Input: Add Europe/Berlin → Output: Berlin 14:30 (UTC+2, +6h vs NY) live.Input: Tokyo default → Output: Tokyo 21:30 JST (UTC+9) live tick.Is it uploaded? No
time is your device's Date formatted via Intl.DateTimeFormat in your browser.
Does it need a server? No
all zones are via Intl; no API call.
Can I add any zone? Yes
via supportedValuesOf if available, else a 20-zone fallback list.
Authoritative specifications, standards, and in-depth reading for World Clock.
Loading clocks...
Evaluate math expressions with functions safely. Use for quick calc; for scientific history use scientific-calculator. Input: expression text. Returns numeric result. 100% client-side.
Calculate percentages, increase, and tips. Use for quick percent math; for change between values use percentage-change-calculator. Input: numbers. Returns percent result. 100% client-side.
Encode and decode geohashes. Use when sharing locations; for timezones use world-clock. Input: lat/lng or geohash. Returns geohash or coords. 100% client-side, files never leave browser.
Stopwatch and timer with laps in browser. Use when timing tasks; for date spans use date-calculator. Input: button controls. Returns elapsed time. 100% client-side.
Estimate arrival time and duration from speed and distance. Use when planning transfers; for date math use date-calculator. Input: numbers. Returns ETA and duration. 100% client-side.
Discount a future lump sum or stream of payments back to today. Result stays in your browser
Solve voltage, current, resistance, and power from any two knowns (V=IR, P=VI).
Projects lump-sum growth from principal, rate, years and compounding frequency. Use when forecasting a one-time deposit; differs from sip-calculator by single deposit vs monthly contributions. Returns maturity value, interest and schedule. 100% client-side.